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Poster: Frank Panucci Date: Apr 28, 2012 10:56am
Forum: prelinger Subject: Newest uploads are great!

Thanks for responding so quickly and fixing the process when I pointed out the interlace issues discussed earlier. The latest batch of uploads are beautifully transferred and NTSC-compliant. They look good on PC and TV, and they yield without complaint to pulldown removal. What a wonderful collection of unearthed rarities...

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Poster: Administrator, Curator, or StaffA/V Geeks Date: Apr 29, 2012 8:27am
Forum: prelinger Subject: Re: Newest uploads are great!

Thanks Frank. I have to blame some ffmpeg settings for the jello files. In the future, we'll be investigating doing inverse telecine on files. Anybody have any suggestions on workflows that work for them? The process would have to let me batch process the files..

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Poster: Scribble Date: Apr 30, 2012 2:37pm
Forum: prelinger Subject: Re: Newest uploads are great!

Hey guys...

Yes, the jello seems to be gone, but I had no luck removing pulldown properly from "Sinclair at the Worlds Fair". I use After Effects, which tries to guess the pulldown cadence, but is unsuccessful, I then cycle through all the possible pulldowns, upper field, lower field, no fields and 24PA pulldowns...all with no luck, it's a shame as older mpeg2 files on the site do not have this problem. I'll try one of the other recent files and see. I also tried using a plugin which supposedly can figure out weird, exotic pulldowns, but it was stumped as well!

Thanks for everything guys...really appreciate your efforts.

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Poster: Frank Panucci Date: May 1, 2012 7:19am
Forum: prelinger Subject: Re: Newest uploads are great!

I haven't tried "Sinclair" yet, but some other recent videos have been good candidates for pulldown removal. When I have a spare few minutes I'll check Sinclair. A few of the recent files have some curious vertical jello, but they're quite watchable, and I haven't closely examined them for tech issues (99% of my Prelinger archive downloads are purely for entertainment). In any event, the most obvious issues seem to have been addressed, and the files that were so affected are being replaced with better encodes (check the file dates - corrected video files are dated from the last week in April 2012, and have more elaborately technical file names than previous encodes of the same videos)

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Poster: Frank Panucci Date: May 1, 2012 8:05am
Forum: prelinger Subject: Re: Newest uploads are great!

Hm. "Sinclair" looks fine for watching on the PC, and it looks good when burned to DVD for TV viewing. However, NO native AE or expensive third-party plugins can break it down to clean 24fps output. I threw the whole professional arsenal at it. It seems this file, while still messed up, is messed up in a far more friendly way than the wonky encodes I first noticed a few weeks ago. I'll check some of the other files later.

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Poster: Scribble Date: May 1, 2012 8:37am
Forum: prelinger Subject: Re: Newest uploads are great!

Thanks Frank...glad to know I'm not losing my mind! It's a shame as many older encodes were easily converted to 24fps...

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Poster: Frank Panucci Date: May 1, 2012 2:38pm
Forum: prelinger Subject: Re: Newest uploads are great!

Other recent files, including the re-encodes, are similar.
That's too bad.
Unfortunately, the file from which I successfully pulled a clean 24fps sequence this past weekend was an older MPEG2 version, which I had mistaken for a new encode. These newer files, while very watchable, have a baffling technical interlace issue, the specific nature of which eludes my perfunctory detective work.

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Poster: Administrator, Curator, or StaffA/V Geeks Date: May 2, 2012 9:01pm
Forum: prelinger Subject: Re: Newest uploads are great!

The jello effect you are seeing to often exists in the original transfer. The films were transferred with a telecine that has a line array CCD or flying spot (Cintel or Bosch FDL-60) where it's capturing the film frame line by line as it moves across the gate. If the film is shrunk, perf holes damaged or there's a big splice, you'll a waterfall where the image height wobbles - very similar to the CMOS artifacts with digital cameras that move faster than the chip can capture a frame.

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Poster: Frank Panucci Date: May 2, 2012 9:35pm
Forum: prelinger Subject: Re: Newest uploads are great!

Sounds logical. Last time I encountered a flying spot scanner was a long time ago. It was a set-top unit that played Super 8 film on TV. I saw one on a shelf at a Union Mission last year. I probably should have bought it. It was $8.

Anyway, the latest transfers look great for fun purposes. Why they defy pulldown removal I can't imagine. I work with video professionally, but the files I deal with are from recent equipment, and almost all are file-based these days. The most "exotic" videos I get are Pro Res or camera-specific codecs that adhere to specific technical requirements. No mysteries, no fun.